JPH03219304A - Method for defining hole shape in cad/cam system - Google Patents

Abstract

PURPOSE:To easily confirm the presence or absence or interference between a defined hole shape and another worked shape by specifying the center positions of respective hole shapes of plural holes, defining the specified points as a group of points, specifying a radius, and displaying the hole shapes of the specified radius around all the points constituting the point group on a graphic display. CONSTITUTION:The center positions of respective hole shapes of plural holes are specified and defined as a group of points in the CAD/CAM system. When a radius is specified in the CAD/CAM system, the hole shapes of the specified radium around all the points constituting the point group are defined and displayed on the graphic display 5. In addition to a convensional 'definition of random-point group' function, the 'definition of hole shape' function for displaying the hole shapes of a specified radium around all points constituting a point group is added to the item of 'definition of point group' in a shape forming system program stored in a floppy disk 8. Consequently relation between these hole shapes and other working shapes can easily be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for defining a hole shape in a CAD/CAM system.

When defining a hole shape using a conventional CAD/CAM system,
It is necessary to specify the center position of the hole shape and the radius of the hole shape.

Generally, hole shapes on a graphic display are defined for each hole shape by specifying the radius of the target hole shape each time the center position of the hole shape is specified. In such cases, it is troublesome to specify the radius for each hole shape and display it on the graphic display, so use the point cloud definition function of the CAD/CAM system to define the center position of the hole shape as a point cloud. define,
In some cases, only the center position of each hole shape is displayed for reference on a graphic display to proceed with the design work.

Problems to be Solved by the Invention On the other hand, the definition of the hole shape in actual machining is determined by the center position of the hole shape specified on the CAD system side and the radius of the hole shape specified on the CAM system side. With conventional technology, the outline of the hole shape is not displayed on the graphic display, making it difficult to grasp the engagement relationship between the hole shape and other machining shapes. If machining is carried out using the same method, interference may occur with other machined shapes.

Therefore, before machining, it is necessary to check the engagement relationship between the hole shape and other machining shapes, but since the radius of the hole shape is not defined in the CAD system itself, the engagement relationship between the machining shapes At the stage of checking the hole shape, it is necessary to specify the radius for each center position of the hole shape defined as a point cloud and display the outline of the hole shape on the graphic display, which makes the confirmation work extremely difficult. There are some troublesome drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the drawbacks of the conventional techniques and to easily check the presence or absence of interference between a defined hole shape and other machined shapes. Our goal is to provide the following.

Means for Solving the Problems The hole shape definition method of the present invention defines the center position of each hole shape for a plurality of holes as a point group, and specifies the radius to define the point group. The above objective was achieved by displaying on a graphic display the shape of the hole with a specified radius for all the points that constitute it.

For multiple holes, specify the center position of each hole shape and use CAD
/Define as a point cloud in the CAM system.

When a radius is specified in the CAD/CAM system, a hole shape with the specified radius is defined for all points making up the point cloud, and the hole shape with the specified radius is displayed on the graphic display.

Example Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figure 2 shows an example of a CAD/C that implements the method of the present invention.
1 is a block diagram showing main parts of an automatic programming device constituting an AM system, in which 1 is a processor (hereinafter referred to as CP);
2 is a ROM in which a program for controlling the automatic programming device is stored; 3 is a RAM in which the system program loaded from the floppy disk 8 and calculation results by the CPU is stored; 4 is a keyboard;
is a graphic display (hereinafter referred to as CRT),
6 is a tablet device, 7 is a disk controller, and 8 is a floppy disk as an external storage device, which stores system programs for executing various work menus. Reference numeral 9 represents a plotter for outputting created drawings, and reference numeral 10 represents a printer. Each of these elements 1 to 10 is connected by a bus 11.

The tablet device 6 has a menu table 6b on the tablet surface 6a.
The work menu can be selected by picking a predetermined item on the menu table 6b with the tablet cursor 6C, or the CRT 5 can be selected in conjunction with the tablet cursor 6C.
A coordinate position can be selected by specifying an arbitrary position on the CRT 5 with a graphic cursor that moves above.

In addition, in the "Point cloud definition" item of the shape creation system program stored on the floppy disk 8, "Random point cloud definition" similar to the conventional one that defines a collection of multiple points without regularity is included. In addition to this function, a ``hole shape definition'' function is added that displays on the graphic display a hole shape with a specified radius for all points that make up the point cloud.

FIG. 1 is a flowchart showing an outline of the "point cloud definition processing" of this embodiment, and the processing from step 81 to step S8 in FIG. The processing from step 89 to step 814 corresponds to a program for implementing the "hole shape definition" function unique to this embodiment.

Hereinafter, a method of defining a hole shape in this embodiment will be explained with reference to a flowchart. It is assumed that the shape creation system program has already been loaded into the RAM 3.

The operator selects the menu table 6b with the tablet cursor 6c.
When you pick the "Point cloud definition J" item, the CPU will:
First, initialize the value of the counter N that counts the number of points constituting the random point cloud (step S1), switch the display of the CRT 5 to the point cloud definition screen, and display the point number (No.) to be input and the point. The data necessary for specifying the position of is displayed as guidance on the CRT 5, and the system enters a standby state waiting for input processing by the operator (step S2).

Normally, the operator specifies the position of a point using the graphic cursor on the CRT 5, or inputs the coordinate component in the X-axis direction and the coordinate component in the Y-axis direction using the keyboard 4. If you have already specified the points, at this stage you can select the RO on keyboard 4.
the primary key specification end key) (step 83).

When the input processing by the operator is executed, the CPU 1
Step S4) to determine whether or not the primary key has been operated;
If the RO primary key has not been operated, then it is determined whether or not an illegal input has been made that would cause a memory overflow or system stackover (step S5). If the input data is appropriate, the currently input N00 ( -N4.
, create point data (XN-1, YN-1) for the points , and additionally store it in the point group data of RAM 3 (step 36), as well as create point data 3' (XN41, YN41).
), display the center position of the point N O, (-Null) on the CRT 5 (Step S7), increment the value of the counter N by 1 (Step S8), and proceed to Step S2. In the same manner as above, each time input processing by the operator is performed, data of newly specified points are sequentially added to and stored in the point cloud data of RAM3,
The position is displayed on the CRT5.

Note that if an unauthorized input is detected in step S5, the process moves to step S2 and waits for appropriate data to be input, and the subsequent processing is started when the appropriate data is input.

FIG. 3 is a diagram showing the display screen of the CRT 5 immediately after the operator has performed appropriate input processing once, and shows the display screen of the CRT 5 in step S.
Based on the X-axis direction coordinate component X = 50.0 and the Y-axis direction coordinate component Y = 20°0 input in step 3, the center position of the first point of NO, 001 is marked on the CRT 5 by the symbol "x". Displayed.

In FIG. 3, as a guidance display for the second input process, point No. 002 and the coordinate components in the X-axis direction and the coordinate components in the Y-axis direction necessary to specify the position of this point are shown. A message will appear asking you to enter.
In the data setting area at the lower left of the CRT 5, a guidance display X=, which instructs input of a coordinate component in the X-axis direction, is first displayed.

This display is switched to a guidance display that instructs the operator to input the coordinate component in the Y-axis direction when the operator operates the keyboard 4, sets the input data, and inputs the coordinate component in the X-axis direction. Axial coordinate component X=-50
, 0 is displayed on the display screen as data corresponding to point No. 002, and when the coordinate component in the Y-axis direction is set and input according to the new guidance display, the input coordinate component in the Y-axis direction Y= 20.0 is displayed on the display screen as data corresponding to point No. 002, the center position of the second point is displayed on the CRT 5 based on the above data, and guidance for the third input process is displayed. Is displayed.

The operator follows the guidance display on the CRT 5 and inputs the data for specifying the third and subsequent points one by one in the same manner. When all necessary points have been specified, the operator presses the keyboard 4.
Operate the RO primary key.

FIG. 4 is a diagram showing the display screen of the CRT 5 immediately after the appropriate input processing by the operator has been executed four times. coordinate component data and coordinate component data in the Y-axis direction are displayed, the center position of each point is displayed with a symbol "x", and guidance for the fifth input process is also displayed.

For example, if all necessary points have been specified by specifying point NO.004, at this stage, point NO.004 is specified.
Instead of inputting the data in step 5, the user operates the RO primary key on the keyboard 4 (step 33).

CPU that detected the RO primary key operation in the process of step S4
I determines whether the value of the counter N is 0, that is, whether at least one point constituting the random point group is specified (step S9), and if N≠0 and even one point is specified. If a point has been designated, the guidance display on the CRT 5 is switched to erase the input message for point N00005 and display a message to input the radius R of the hole shape (step 510). When the operator inputs the radius according to this message (step 511), it is determined whether or not there has been an unauthorized input such as data input outside the input range of the numerical function (step 512). If the input data is appropriate,
After determining whether the value of the input radius is 0 (step 513), if the value of the input radius is not 0, a hole shape with radius R is drawn for all points constituting the random point group. ,
Display on the CRT 5 (step 514). in this case,
The radius R is centered around each of the points from point N00001 to point No. 004 stored in the point group data of RAM3.
The hole shape will be drawn (see Figure 5).

Note that if an unauthorized input is detected in step S12,
The process moves to step 810 and waits for appropriate data to be input, and when the appropriate data is input, subsequent processing is started. Furthermore, if the radius R is input as O in step 311, the process in step S14 is not executed.
As in the past, only the positions of the points forming the random point group are displayed (see Figure 4). After completing all processes in the point cloud definition process, the CPUI displays a message instructing input of the next command, and then enters a standby state waiting for a command.

In addition, if the hole shape displayed on the CRT5 is checked and interference with other machining shapes is detected, if the hole shape is a pin hole or bolt hole, the design and strength may be affected by making the hole shape smaller. If the problem does not occur, the CPU 1 may be forcibly returned to step SIO or step S11 after the above processing is completed, and only the radius of the hole shape may be redefined to avoid interference.

Effects of the Invention According to the hole shape definition method of the present invention, the outlines of all hole shapes defined using the point cloud definition function are displayed at once on a graphic display for the center positions of all the hole shapes. Therefore, the engagement relationship between these hole shapes and other machined shapes can be easily confirmed, and the occurrence of interference between the machined shapes can be prevented.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an outline of processing in an embodiment of the method of the present invention, and FIG. 2 is a block diagram showing essential parts of an automatic programming device constituting a CAD/CAM system of an embodiment for implementing the method of the present invention. 3 to 5 are conceptual diagrams illustrating display states of the graphic display of the automatic programming device. 1... Processor (CPU), 2... ROM. 3... RAM, 4... Keyboard, 5... Graphic display (CRT), 6... Tablet device, 7... Disk controller, 8... Floppy disk, 9... Plotter, 10 ...Printer, 11...Bus.

Claims (1)

[Claims] For multiple holes, by specifying the center position of each hole shape and defining it as a point group, and specifying the radius, you can graphically draw the hole shape with the specified radius for all the points that make up the above point group. C characterized by being displayed on a display
How to define hole shape in AD/CAM system.